A bang, vibrations, and a loss of rotor speed are typical symptoms of a main rotor strike. Although no clearly identifiable rotor strike marks were found on the stumps in the area of the attempted landing site, the marks and the trapped wood fibres on the main rotor blade tip are consistent with a rotor strike, likely against a stump that protruded into the area of the rotor disk. It is likely that, when the pilot approached the decommissioned road, his attention was focused on evaluating the suitability of the landing surface and he did not recognize that a stump extended into the main rotor disk area. Although the helicopter was airborne, the vibrations and the decaying main rotor speed which resulted from the strike forced the pilot to land immediately. The helicopter touched down on the steep sloping terrain and rolled over.Analysis A bang, vibrations, and a loss of rotor speed are typical symptoms of a main rotor strike. Although no clearly identifiable rotor strike marks were found on the stumps in the area of the attempted landing site, the marks and the trapped wood fibres on the main rotor blade tip are consistent with a rotor strike, likely against a stump that protruded into the area of the rotor disk. It is likely that, when the pilot approached the decommissioned road, his attention was focused on evaluating the suitability of the landing surface and he did not recognize that a stump extended into the main rotor disk area. Although the helicopter was airborne, the vibrations and the decaying main rotor speed which resulted from the strike forced the pilot to land immediately. The helicopter touched down on the steep sloping terrain and rolled over. The pilot attempted an off-level, hovering landing at an unsuitable site. The main rotor blade likely struck a stump, causing vibrations and the main rotor speed to decay. The pilot was forced to land on steep sloping terrain, which caused the helicopter to roll over. The passengers were not wearing the available shoulder harnesses.Findings The pilot attempted an off-level, hovering landing at an unsuitable site. The main rotor blade likely struck a stump, causing vibrations and the main rotor speed to decay. The pilot was forced to land on steep sloping terrain, which caused the helicopter to roll over. The passengers were not wearing the available shoulder harnesses. The pilot was attempting a hovering landing at an unsuitable site when the main rotor blades likely struck a stump. The pilot was subsequently forced to land on steep sloping terrain, which caused the helicopter to roll over.Causes and Contributing Factors The pilot was attempting a hovering landing at an unsuitable site when the main rotor blades likely struck a stump. The pilot was subsequently forced to land on steep sloping terrain, which caused the helicopter to roll over. Following this accident, the BC Ministry of Forests took the following actions: Forestry inspectors were coached to be more vocal in situations where they felt uncomfortable; A memo was issued to employees reminding them of the policy requiring the wearing of shoulder harnesses during flights; and A new policy was established requiring that an ELT be carried on board any aircraft chartered by the Ministry regardless of the circumstances.Safety Action Taken Following this accident, the BC Ministry of Forests took the following actions: Forestry inspectors were coached to be more vocal in situations where they felt uncomfortable; A memo was issued to employees reminding them of the policy requiring the wearing of shoulder harnesses during flights; and A new policy was established requiring that an ELT be carried on board any aircraft chartered by the Ministry regardless of the circumstances.